CodeGen: Use asm register names in warning message

This was using the ugly tablegenerated register enum names, which are
really hideous for register tuples on AMDGPU. Use the prettier names
which are recognized by the asm parser.

Author: arsenm

llvm/lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp

@@ -398,9 +398,9 @@ void AsmPrinter::emitInlineAsm(const MachineInstr *MI) const {
   if (!RestrRegs.empty()) {
     std::string Msg = "inline asm clobber list contains reserved registers: ";
     ListSeparator LS;
-    for (const Register &RR : RestrRegs) {
+    for (const Register RR : RestrRegs) {
       Msg += LS;
-      Msg += TRI->getName(RR);
+      Msg += TRI->getRegAsmName(RR);
     }
     const char *Note =
         "Reserved registers on the clobber list may not be "

llvm/test/CodeGen/AMDGPU/inline-asm-reserved-regs.ll

@@ -1,38 +1,38 @@
 ; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -verify-machineinstrs -o /dev/null 2>&1 %s | FileCheck -check-prefix=ERR %s
 
-; ERR: warning: inline asm clobber list contains reserved registers: VGPR42
+; ERR: warning: inline asm clobber list contains reserved registers: v42
 ; ERR: note: Reserved registers on the clobber list may not be preserved across the asm statement, and clobbering them may lead to undefined behaviour.
 define amdgpu_kernel void @clobber_occupancy_limited_vgpr() #0 {
 entry:
   call void asm sideeffect "; clobber $0", "~{v42}"()
   ret void
 }
 
-; ERR: warning: inline asm clobber list contains reserved registers: VGPR42_VGPR43
+; ERR: warning: inline asm clobber list contains reserved registers: v[42:43]
 ; ERR: note: Reserved registers on the clobber list may not be preserved across the asm statement, and clobbering them may lead to undefined behaviour.
 define amdgpu_kernel void @clobber_occupancy_limited_vgpr64() #0 {
 entry:
   call void asm sideeffect "; clobber $0", "~{v[42:43]}"()
   ret void
 }
 
-; ERR: warning: inline asm clobber list contains reserved registers: M0
+; ERR: warning: inline asm clobber list contains reserved registers: m0
 ; ERR: note: Reserved registers on the clobber list may not be preserved across the asm statement, and clobbering them may lead to undefined behaviour.
 define amdgpu_kernel void @clobber_m0() {
 entry:
   call void asm sideeffect "; clobber $0", "~{m0}"()
   ret void
 }
 
-; ERR: warning: inline asm clobber list contains reserved registers: EXEC
+; ERR: warning: inline asm clobber list contains reserved registers: exec
 ; ERR: note: Reserved registers on the clobber list may not be preserved across the asm statement, and clobbering them may lead to undefined behaviour.
 define amdgpu_kernel void @clobber_exec() {
 entry:
   call void asm sideeffect "; clobber $0", "~{exec}"()
   ret void
 }
 
-; ERR: warning: inline asm clobber list contains reserved registers: EXEC_LO
+; ERR: warning: inline asm clobber list contains reserved registers: exec_lo
 ; ERR: note: Reserved registers on the clobber list may not be preserved across the asm statement, and clobbering them may lead to undefined behaviour.
 define amdgpu_kernel void @clobber_exec_lo() {
 entry: